Motor suction-pump.



W. H. KELLER.

MOTOR SUCTION PUMP.

APPLIOATION HLED P21117. 1909.

Patented NOV. 15, 1910.

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MOTOR SUGTION PUMP.

APPLICATION FILED P21117, 1909.

975,532, Patented Nnv.15,1910.

lUruTED sTATEs PATENT oEnIcE.v`

WILLIAM H. KELLER, F PHILADELPHIA, PENNSYLVANIA, ASSIGNOB TO KELLER MANUFACTURING COMPANY, 0F PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF DELAWARE.

MOTOR SUC'IION-PUMI.

Specification of Letters Patent.

Patented Nov. 15, 1910.

Application led February 17, 1909. Serial No. 478,424.

I0 of January 16th, 1909, `Serial Number 472,572, I have shown and described a form of rotary suction pump which I have found admirably adapted to employment in vacuum cleaners and other similar apparatus.

It is the object of the present invention to directly and coaxially combine a suction pump of that type with an electric motor, in such a way as to secure the highest eiiciency and the greatest rcompactness and strength. To this end the rotary suction pump and the electric motor are not only coaxially mounted, but are contained within the same casing and employ a common central journal. A circuitous muilier passage surrounds the pump and the exhaust from the pump is led first through this passage and is then driven back into the motor chamber where it circulates so as to assist in cooling the coils of the motor, an important consideration in a motor running at the high speed required for direct connection with a rotary pump of this character.

The other details of construction to which my invention relates will be made clear by the specification which follows In the accompanying drawings, Figure I, is a plan section of avmotor pump conveniently embodying my invention. This lonitudinal section is also. indicated by the line I, in Fi II. Fig. II, is a cross section taken on t e line II, II, in Fig. I. Fig. III, is an elevation looking from the right of Fig. I, and with the motor hood removed.

In the said gures, l, designates a substantially cylindrical casing which is inten nally divided into a pump chamber 2, and a motor chamber 3, by means of a partition 4, which is reinforced by radial webs 5, which extend from a. central bearing 6, to the wall 7, which is common to the said cham bers 2, and 3, and divides them from a peripheral passage, also included within the casing l.

Eccentrically mounted the Jpump,

chamber 2, is the hollow cylindrical drum or piston 10, of which the end wall 1l, is provided with a central recess l2, within which is seated the circular, disk 13, formed on the end oit a shaft l5, which is journaled within a sleeve 16, supported in the central bearing 6, on the partition 4. The other part of this shaft carries the armature 14, of the motor. The said disk 13, on the shaft l5, is secured to the piston by means of a screw 20, and is prevented from rotating relatively thereto by a pin 2l. The cover plate or cap 25, of ,the pump chamber 2, supports a pin 26,I which is located concentrically with respect to the said chamber, but eccentricall in relation to' the drum, and forms-a pivot for fans or blades 30, swinging thereon. The said fansor blades slide within the split rocking pins 31, which are rotatably mounted within slotted sockets 32, formed within the drum 10, in proximity to its periphery.

It will be seen by reference to' Fig. II, that as ythe blades 30, are rotated within the chamber 2, by the motion of the drum 10, the said blades and the. rocking pins 31, will slide relatively to each other to compensate or the eccentricity of the said drum l()J with respect to the chamber 2'. As

the drum 10, rotates it is always in tan entia-l contact' with the inner per1phery o the chamber 2, at the point 35'. This acts as a seal between the suction port 36, and exhaust port 37, of the chamber 2. The blades 30 are in constant Contact with the walls of the pump chamber and will therefore, positively force the air through the pump. As the blades 30, are rotated in a clock-wise direction, the air is drawn through port 36, as indicated by the arrows in Fig. II, and exhausted through the port 37 into the peripheral chamber 8, which surrounds the chamber 2. The said chamber 8, acts as a muiiler,

In order 'to minimize the weight of the apparatus, I cast the casing 1, of a comparatively light metal, preferably aluminum, thus occasioning the necessity of constructing the iield frame of the motor separately. I prefer to build up the field frame 60, of the motor of stamped laminations, having the usual pole pieces 61, which are surrounded by the magnetizing coils 62, as clearly shown in Figs. I, and III. 'Ihe field frame 60, its snugly between a series of lugs 63, cast integrally with the casing 1, on its inner periphery and is secured thereto by moans of stud bolts 65, which are provided with nuts 66, and after passing through apertures in the said field Jframe, are threaded into the said lugs 63. The spaces thus allowed between the frame 60, the inner periphery of the casing l, and lugs 63, afford passages for the exhaust air of the pump by means of which the magnetizing coils are effectively cooled.

Having thus described my invention, I claim y l. A motor suction` pump comprising a casing, a partition located within said casing intermediate its ends, a cap for closing one end of said casing and forming a pump chamber, a rotary piston located within said chamber and having means for enga ing the walls of said chamber for positive y forcing air through said pump, an inlet port yleading to said pump chamber, an exhaust port leading from said chamber through said partition to the other side thereof a motor mounted on the opposite side of said partition'from said pump chamber, a cap for the other end of said casing,

openin s formed in said cap forming an outlet or the exhaust from said pump.

2. A motor suction pump comprising a casing, a partition 'located intermediate the ends of said casing, a pump chamber o1.. one side of said partition, a rotary piston mounted in said chamber and havin means for engaging the walls of said cham er for positively forcing air through said pump, a motor located Within said casing on the otherA side of said partition, said casing having passages formed therein and connecting saidl pump chamber with the chamber for the motor, said motor including a field frame separated from the casing so as to provide a passage for the exhaust air from t e pump, a rotating armature and a common shaft for supporting said rotary piston and said rotary armature.

3. A casing for a motor suction pump cylindrical in orm and provided with a central partit-ion dividing it into two parallel vania, this thirteenth da of February 1909. 4I0

WILLI Witnesses:

Jamas H. BELL, E. L. Furmza'roN.

H. KELLER. 

